Question

Six fair coins are tossed simultaneously. Number of ways in which atmost three of the coins turn up as heads in a definite order, is

• A. 32
• B. 41
• C. 42
• D. 6

Answer 1

Answer: (C)

${}^6{C}_0+{}^6{C}_1+{}^6{C}_2+{}^6{C}_3=42$